AN IRISH. TRAGEDY forever unshaken as the greatest mathematical contribution to science since the Principia of Newton. His early work, on which his imperishable glory rests, lie came to regard as a thing of but little moment in the shadow of what he believed was his masterpiece. To the end he was humble and devout, and wholly without anxiety for Ms scien- tific reputation. ;I have very long admired Ptolemy's descrip- tion of his great astronomical master,- Hipparchus, as dvyp 6tXo7rovos KO! </>iAa\7)dy$; a labour-loving and truth-loving man. Be such my epitaph.'